..I think several are missing the point, question that the OP asked. He (original poster) owns a Motorhome, not a TT or 5er. He asked about 12V impact drill/wrench, specifically for the purpose of handling the lug nuts on his Motorhome.
He did not ask about cordless drills that can be used to work stabilizer jacks. Such would be pretty much worthless for what he wants to do here.
This is a subject I'm interested in as well, actually. I've been thinking about getting a 12V impact as well, one thats strong enough to take the lugs loose on our Class A MH. Specs call for 165 ft-lbs of torque on the lug nuts, but I'm sure it will take a lot more than that to break them loose.
Here's a
Kawasaki 12V impact wrench at Northern Tool I've been thnking about. However, not sure if 280 ft-lbs will be enough, to take off the lugs on a Class A?